Maia is the protagonist of the series. She has lost all of her childhood memories, because as a child, Maia was put into a one year coma because of a car wreck. The cause of it was because while in the car with her parents, the controls malfunctioned. Her parents died. Waking up, she was introduced to a man claiming to be her grandfather. In episode 11, Maia tells the girls of Nereids her story of waking up from her coma. During the flashback, Maia asks her grandpa why whenever he smiles at her, he seems sad. At the end of the episode, she is looking at a picture of her grandfather then she asks, "What is it that you were keeping hidden from me, Grandpa." Maia is an excellent student, yet having been rejected by the Ocean Agency,elite paramilitary Ocean Agency, part of the futuristic world government and only the best, most intelligent, and physically fit students are eligible for admission. Maia, was set to become one of the few. Maia has found work with Nereids, an unorthodox help-for-hire organization inspired by the Greek mythological Nereids. She is optimistic, hard working, and honest, yet a naïve and shy cute girl-next-door. Maia is in search of her past while working with Nereids
Maia is young slender girl with brown eyes and hair which hangs on each side with a silver hair clip. Her outfit is generally a light pink/white dress with a pink turtle neck and matching wrist bands with brown sandals. When she is a sleep she wears a pink or yellow T-Shirt with green or brown shorts. While on mission she has a white jump suit in various pieces. In episode 19 she wore a yellow sleeveless top and blue jeans shorts.
As a kid she has much shorter her and her outfit consisted of a white sleeveless top with light purple leggings, after waking up she wore a long pink dress. When sleeping she wore a set of pink pajamas.